Trump also refrained from openly endorsing U.K. Prime Minister Theresa May's leadership but praised the former foreign secretary Boris Johnson, who resigned Monday in protest at the Brexit deal May presented to the cabinet over the weekend for being "weak".
Trump will then join wife Melania as they head to Windsor Castle for their audience with the Queen before flying out to Scotland, where they are expected to visit both Trump Turnberry and Trump International Golf Links Scotland.
Safety alerts are normally issued to foreign citizens by their embassies in times of political instability, terrorism, and natural disasters; but the USA embassy in London has had to issue a "demonstration alert" on Tuesday ahead of planned protests for July 12 to 14.
"When we leave the European Union we will begin to chart a new course for Britain in the world and our global alliances will be stronger than ever", May said ahead of Trump's visit.
The shadow policing minister, Labour MP Louise Haigh, said, "It has emerged that officers being accommodated in Essex are sleeping on cots in squash courts, 100 female officers with four toilets between them, likely to be sleeping on mats tonight, 300 male officers with five toilets between them".
May contacted Trump days after he was inaugurated, extending the invitation for a coveted state visit that would be hosted by Queen Elizabeth II, but that gesture has proved far more controversial than expected as Trump has shown little interest in maintaining "diplomacy as usual" with European allies.
But besides that, the United States president is set to avoid much of the mass protests as most of his official engagements have been planned outside London. A spokesperson for Downing Street told i the First Lady will be spending time with veterans and school children at a location in London on Friday morning, although they could not comment on where this visit would take place. But on Thursday they said they welcomed the plan and would study it closely. They will be doing that in concert with the Civil Aviation Authority, the US Air Force and the RAF. Activists aim to fly a giant orange balloon of the president depicted as a baby in a diaper above Parliament Square.
Almost every force in England and Wales has contributed officers to help with the massive mobilisation, the biggest since the 2011 riots.
The Trumps are joining Prime Minister May and other British business leaders at the black-tie dinner at the palace to kick off their visit to Britain.
In a statement ahead of Trump's arrival, she said the visit would focus on trade and strengthening defence and security ties, saying there was no stronger alliance than Britain's "special relationship with the U.S.".
Yet Trump's schedule will largely keep him out of central London.
Ahead of his arrival the PM said she would use the visit to "forge a strengthened, ambitious and future-proof trade partnership" with the U.S. after Brexit.
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